Shandong Tangrong steel import and Export Trading Co., Ltd belongs to Shandong Huixin group.shandong Huixin Group is a large steel deep processing enterprise integrating the production, sale and trade of coated steel plates, color coated steel plates, cold-rolled plates and zinc ingots. The group was established in October 2009, located in the hometown of the filial son in the Han Dynasty, Dong Yong - Boxing County, Shandong Province. It has more than 1,000 employees, being equipped with advanced production equipment, and strong technical force.

Cold Rolled steel plate is processed by hot-rolled plate at room temperature, although in the process of processing because the rolling will also make the steel plate heating, even if it is called cold-rolled. Because of hot rolling through continuous cold deformation of cold-rolled, Cold-rolled Steel Plates in mechanical performance is relatively poor, hardness is too high. It is necessary to undergo annealing to restore its mechanical properties without annealing, called rolling hard rolls. Rolled hard rolls are generally used to make products without bending and stretching.